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标题: 求救！！Prep 2道数学题！谢谢！ [打印本页]

作者: mudiduanger 时间: 2010-9-27 07:03 标题: 求救！！Prep 2道数学题！谢谢！

1.DS:  is the thre-digit number n<=550
条件1. the product of the digits in n is 30
条件2.  the sum of digit in n is 10

答案是C，我的算法是条件1推出：xyz=30  2推出：x+y+z=10  但我觉得1、2推不出 100x+10y+z<=550.

2. Bobby bought two share of stock, which sold for 96 each. If he had profit of 20% on the sale of the shares but a loss of 20% on the sale of the other share, then on the sale of both shares combined b bobby had.

答案是 the loss of 8,       我选的是 no loss, no profit.  我知道我选的错了，可是就是算不出the loss of 8.

大家帮帮忙吧！！！谢谢！！！

作者: MarilynR 时间: 2010-9-27 20:38

第一题
条件一可得三个数字为 1，5，6 或者 2，5，3 ，不充分
条件二单独不充分两者结合可得三个数字为 2，5，3，任意组合《=550

第二题能不能把原题原样子打出来？

作者: wangliming 时间: 2010-9-28 06:43

two share of stock......share应该有s吧

作者: jingjane222 时间: 2010-9-28 20:03

第２题

0.96=1.2*X1 X1=0.8 (Share 1 with 20% gain)
0.96=0.8*X2 X2=1.2 (Share 2 with 20% loss)

X1+X2=2.00 (original price paid)
0.96*2=1.92 (price sold)

Loss 应该是 8 cents or 4%

作者: mudiduanger 时间: 2010-9-29 06:44

谢谢大家解答，明白了！！祝好运！

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